Hi Jason. You don't have to post this if you don't want. I believe you missed my point. Entirely. Your illustrations of different R-squared's fitted to different pictures is entirely spurious, and misses the primary mechanism for such random noise. You would not put diesel in a petrol car, and expect to take it for a ride. Similarly, you should not use R^2 or correlation for price series. You can, but you commit the same error that you are trying to illuminate to your readers, hence falling into the same trap as everyone else. Read the papers that your reader Emlyn suggests above - I fear you don't understand the statistical issues here. Kind regards, Adam.